Plant Image
Aspen Creek Tr - SS

Yavapai County Native & Naturalized Plants

Conyza canadensis - Canadian horseweed

Other Common Names: horseweed
Plant Form: Forb

Family: Asteraceae

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Aspen Creek Tr
Flower head
Aspen Creek Tr
Aspen Creek Tr
Leaf attachment
Aspen Creek Tr
Plant - summer
Aspen Creek Tr
Young plant - summer
Aspen Creek Tr
Forb Plant Description

Origin: Introduced   Life Cycle: Biennial or annual
General Desc: A common vertical standing native weed. Not branched except for multiple flowering stems spreading outward near the top of the plant. Considered invasive in some areas of the U.S. Heights reported as much as 7 feet.
Height: 3 feet


Habitat Description: Found throughout the U.S. in pastures, fields, waste areas and along roadsides. Grows in many different soils.
Plant Communities: Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest, Riparian, Disturbed Areas
Elevation: 1000 - 8000 feet

Flower Characteristics

Color: White and yellow     Shape: Daisy or Dandelion-like in clusters     Tubular: N     Flowering Period: Jul - Oct
Description: Has many inconspicuous flowers forming small composite flower heads about 1/8 inch across. Composite heads have white ray flowers and yellow disk flowers.

Leaf and Stem Characteristics

Leaf Color: Green     Leaf Type: Simple     Leaf Shape: Narrow     Leaf Margin: Smooth     Leaf Attachment: Alternate     Leaves Clasp: N
Hairs: Leaves and stems     Spines: N
Leaf Description: Leaves alternate around the main vertical stem. To 4 inches in length and 1/2 inch in width. Has a few white hairs along the edge.

Fruit and Seed Characteristics

Fruit Color: Brown   
Fruit Type: Achene
Fruit Notes: Elliptic in shape.

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 3.1  
Last Updated: June 15, 2013  
Content Questions/Comments: Email Jeff Schalau  
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